Wood is generally considered a linear orthotropic viscoelastic. The creep of cell wall under long-term load is important for the deformation and destruction of wood. The aim of this study was to investigate the difference of creep compliance between compound middle lamella (CML) and secondary S₂ layers by nanoindentation creep testing. The results indicated that the creep compliance of cell wall under compression along grain increased with the maximum load and loading rate increasing. Furthermore, the creep compliances and creep compliance percentages of the CML layer were more than that of the secondary S₂ layer, and the viscoelastic behavior of the CML layer also was more sensitive to MC compared with the S₂ layer. Finally, the Burgers’ model was appropriate for predicting the viscoelastic behavior of wood cell walls. The parameters of Burgers’ model dropped markedly with increased MC. These parameters in the CML layer also were lower than those of S₂ layer. The differences of creep properties between the CML and S₂ layers can prove that the slippage failure of cell wall under compression along grain occurs in the S₂ layer.

木材通常被认为是线性正交各向异性粘弹性的。长期载荷下细胞壁的蠕变对于木材的变形和破坏很重要。这项研究的目的是通过纳米压痕蠕变测试研究复合中间层（CML）和次生S ₂层之间的蠕变柔度差异。结果表明，随着最大载荷和载荷速率的增加，沿颗粒压缩的细胞壁的蠕变顺应性增加。此外，CML层的蠕变柔量和蠕变柔量百分比高于次要S ₂层，并且与S ₂相比，CML层的粘弹性对MC也更敏感。层。最后，Burgers模型适用于预测木细胞壁的粘弹性行为。随着MC的增加，Burgers模型的参数显着下降。CML层中的这些参数也低于S ₂层。CML层和S ₂层之间的蠕变特性的差异可以证明，在沿S ₂层的压缩作用下，细胞壁在沿颗粒压缩下的滑动失败。